Two wwan cases result not correct

[Rick Wu]

[Summary]
There are two wwan auto test cases result not correct. Seems the case should be fail, but checkbox marked as pass.

1.wwan/check-sim-present-{manufacturer}-{model}-{hw_id}-auto
  This case will pass even SIM card not been inserted and sim path is "/".
===== busctl introspect org.freedesktop.ModemManager1 /org/freedesktop/ModemManager1/Modem/0 =====
...
.Sim property o "/" emits-change
...

2.wwan/gsm-connection-{manufacturer}-{model}-{hw_id}-auto
  This case will pass even gsm connection not been established.
 ===== log for output =====
  Connection 'GSMCONN' (6467a58f-ebe7-4643-90ad-721f53e4e5ce) successfully added.
  Error: Device for nexthop is not up.
  Connection 'GSMCONN' (6467a58f-ebe7-4643-90ad-721f53e4e5ce) successfully deleted.

[Jonathan Cave (jocave)]

@Rick thanks for the bug report - can you provide some information about how to reproduce the bugs? which devices does this happen on and which images?

[StanleyHuang (stanley31)]

@Jonathan,

I did some testing with Rick yesterday. For both issue, we have to raise sys.exit(1) rather than return 1. So the checkbox could not get the status code of last command. Thanks.

I will send an MR latter. :)

[Jonathan Cave (jocave)]

A fix is obviously welcomed, but please add the information requested to the bug. It's important we understand how badly this may have effected testing.